AS1905C23-T

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Power management integrated circuits (PMICs) are electronic components used to manage the power of many electronic devices. PMICs can control and optimize the voltage, current and energy consumption of different electronic devices and systems. Supervisors are a type of PMIC which provide system reset, power-on reset and oscillator start-up for many electronic devices. AS1905C23-T is a supervisor device which has many applications and a well-defined working principle.

Applications of AS1905C23-T

AS1905C23-T is a low-cost, low-power supervisor used to detect power-on or power-off events. It can be used to manage power supply sequencing, reset microprocessors or Automotive Electronic Control Units (ECUs) during power up or power down, and provide reset assurance times. It is also used in applications requiring manual reset like gaming laptops, automotive radios, media players, and instrument panels.

In data processing and networking applications, AS1905C23-T helps detect voltage glitches, under or over voltage conditions, power brownouts or power surges. When any of these conditions occur, the device will trigger a reset to prevent the microprocessor from entering a malfunctioning state. It can also be used to monitor and control the supply rail of analog related circuits, protecting the system from any transient or over-voltage conditions. This is important in industrial control applications, server servers, telecommunications equipment, and medical device applications.

Working Principle

The AS1905C23-T utilizes an internal voltage monitor circuit, or comparator, to detect power on and power off events. The device has an adjustable power-on reset voltage threshold, and a built-in oscillator circuit. When power is applied, the device starts its internal oscillator and begins to monitor the voltage. When the voltage reaches the preset power-on threshold, a reset signal is triggered by the device, allowing for system reset, power-on reset and oscillator start-up. When the monitored voltage level drops below the preset power-on reset threshold, the device triggers the reset signal once again, indicating the power-off event.

The device has a built-in “reset assertion times” feature which determines how long the reset remains active. The assertion time can be programmed through external resistor programming, or by using different device variants with pre-defined reset assertion times between 1ms and 6 seconds. This feature is especially useful to ensure that the system reset is not activated too often which could lead to system instability.

Conclusion

AS1905C23-T is a supervisor device with many applications in the power management integrated circuit sector. It can be used to provide system reset, power-on reset and oscillator start-up for different electronic devices, helping to detect power-on or power-off events, voltage glitches or over-voltage conditions. The device also has an adjustable power-on reset voltage threshold and a built-in “reset assertion times” feature to prevent system instability.

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